Uploaded January 2024 | Updated September 2026, 1 week ago

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Repairing a USB phone charger from Lenovo. How to test components in a switching power supply and find the failure. Sometimes the problem can be a bad solder joint instead of a faulty component.

The Fnirsi FNB58 USB tester:
fnirsi.com/products/fnb58?sca_ref=9216013.ntkg5GeG0R&utm_source=af&utm_medium=ref&utm_campaign=9216013

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